Fill cocktail shaker ½ full with ice. Add rum, lime juice, and simple syrup.
Seal shaker, then shake vigorously for 10 to 15 seconds.
Strain into a chilled coupe glass. Garnish with a slice of lime or a lime twist.
Serve immediately. Enjoy!
Notes
Homemade simple syrup takes two ingredients and five minutes to make. Check out this easy recipe if you've never made it before.Don't want to make simple syrup? Substitute 2 level bar spoons of superfine sugar.To make two drinks at once, fill shaker ¾-full with ice and double ingredients (4 ounces rum, 2 ounces lime juice, 1 ounce simple syrup).